Delete rows in cell that contain part of string

Question

newbie9 2019-3-13

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https://ww2.mathworks.cn/matlabcentral/answers/449731-delete-rows-in-cell-that-contain-part-of-string

评论： Image Analyst 2024-7-17

I have an Nx2 cell (mixes of strings and doubles) that I'm trying to clean up (rawdata). Specifically, I am trying to delete all rows with ">" in the first column. My code below is deleting those rows, but it is reshaping the cell as an Mx1 cell (data1). I'm not sure where the error is. Thanks for any help.

rawdata = textscan(fid, '%s %s' , 'HeaderLines', 7);
rawdata = [rawdata{:}];
data1 = rawdata(cellfun(@(s)isempty(regexp(s,'>')),rawdata));

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Answer 1

madhan ravi 2019-3-13

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https://ww2.mathworks.cn/matlabcentral/answers/449731-delete-rows-in-cell-that-contain-part-of-string#answer_365084

编辑：madhan ravi 2019-3-13

在 MATLAB Online 中打开

Cell(strcmp(Cell(:,1),'>'),:)=[]

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KAE 2024-7-17

So compact!

Image Analyst 2024-7-17

在 MATLAB Online 中打开

Example with 2-by-2 cell array:

Cell = { '>', 123, 'abc', 'xyz';  '2abc', 456, '>' 'str'}
Cell = 2x4 cell array
    {'>'   }    {[123]}    {'abc'}    {'xyz'}
    {'2abc'}    {[456]}    {'>'  }    {'str'}
Cell(strcmp(Cell(:,1),'>'),:)=[]
Cell = 1x4 cell array
    {'2abc'}    {[456]}    {'>'}    {'str'}

Note that row 1 is gone because the first cell in that row is '>'.

Not sure how certain you are that the > contains no white space but you may make it more robust by using strtrim and/or startsWith, for example if the > was the first non-white character and had other characters after it, you could do it this way:

Cell = { ' >    ', 123, 'abc', 'xyz';  '2abc', 456, '>' 'str'}
Cell = 2x4 cell array
    {' >    '}    {[123]}    {'abc'}    {'xyz'}
    {'2abc'  }    {[456]}    {'>'  }    {'str'}
Cell(startsWith(strtrim(Cell(:,1)),'>'),:)=[]
Cell = 1x4 cell array
    {'2abc'}    {[456]}    {'>'}    {'str'}

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Answer 2

newbie9 2019-3-13

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https://ww2.mathworks.cn/matlabcentral/answers/449731-delete-rows-in-cell-that-contain-part-of-string#answer_365082

编辑：newbie9 2019-3-13

在 MATLAB Online 中打开

Below works, but perhaps is not the most elegant code.

rawdata = textscan(fid, '%s %s' , 'HeaderLines', 7);
fclose all;
rawdata = [rawdata{:}];
idx = strfind(rawdata(:,1),'>');
tf = cellfun('isempty', idx);
tf = [tf tf];
data1 = rawdata(tf);
data1 = reshape(data1,[length(data1)/2, 2]);